Abstract: A positive displacement pump (1) with a pump head (3), in which (3) at least one pump space (6) is provided, with a pump diaphragm (7), which is associated with the at least one pump space (6) and which (7) separates the pump space (6) from a reciprocating drive.

Abstract: A device (1) is used to mount a pump on a base plate (4) in a structure-borne noise-insulated manner, with the pump including a pump flange (6, 6a, 6b) having at least one mounting hole (9, 19). A mounting screw (2) engages in the mounting hole (9, 19) and detachably mounts the pump flange (6, 6a, 6b) on the base plate (4). Elastic intermediate elements (7, 8) are provided between the upper side of the base plate (4) and the lower side of the pump flange and between the upper side of the pump flange and the screw head (11). A peripheral gap is present between the mounting screw (2) and the mounting hole wall (9, 19) of the pump flange (6, 6a, 6b).